Sensory - Taste Development
Embryology - 5 Jun 2024 Expand to Translate |
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Introduction
These notes introduce the development of the sense of taste which can divided into five basic tastes: bitter, salty, sweet, umami (savoury) and sour. Current research appears to have displaced the historic concept of a tongue "map".
A study in rat suggests that neonatal changes in circumvallate papillae may result in postnatal changes in "taste".[3]
In frogs, a large taste disc (TD) is the largest vertebrate gustatory organ. Postnatally, the sense of taste is also closely related to the sense of smell.
Taste Links: Introduction | Student project | Tongue Development | Category:Taste | ||
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Senses Links: Introduction | placode | Hearing and Balance hearing | balance | vision | smell | taste | touch | Stage 22 | Category:Sensory |
Some Recent Findings
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More recent papers |
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This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
More? References | Discussion Page | Journal Searches | 2019 References | 2020 References Search term: Taste Development <pubmed limit=5>Taste+Development</pubmed> |
Development Timing
These are human embryonic timings[9], not clinical which is based on last menstral period +2 weeks Template:G.
Week 6 - gustatory papilla, caudal midline near the foramen caecum
Week 6-7 - nerve fibers approach the lingual epithelium
Week 8 - nerves penetrate epitheilai basal lamina and synapse with undifferentiated, elongated, epithelial cells (taste bud progenitor cell)
Week 10 - shallow grooves above the taste bud primordium
Week 12 - first differentiated epithelial cells (Type II and III)
Week 12 -13 - maximum synapses between cells and afferent nerve fibers
Week 14 - 15 - taste pores develop, mucous
Week 18 - substance P detected in dermal papillae, not in taste bud primordia
3rd Trimester -
Tongue Development
Taste Buds
Circumvallate papilla are tongue surface specialisation of large size, varying in number (8-12) forming an inverted letter V shape on the dorsum of the tongue immediately in front of the foramen cecum and sulcus terminals. Numerous "taste buds" are located on the sides of these circumvallate papilla (vallate papilla)as well as with fungiform papilla. The three types of tongue papillae from numerous to few are: filiform, fungiform and circumvallate.
Other adult locations include the fimbriæ linguæ, under surface of the soft palate, and on the posterior surface of the epiglottis.
Gustatory Cranial Sensory Neurons
Cranial nerves VII, IX and X have dual embryonic origins and provide both gustatory (taste) and non-gustatory (touch, pain, temperature) sensory innervation to the oral cavity of vertebrates.
Gustatory Neurons
- originate from epibranchial placodes
- innervate taste buds
- project centrally to the rostral nucleus of the solitary tract (NTS)
General Epithelial Innervation of the oral cavity
- originate from cranial neural crest
- innervation to the oropharynx
- project to non-gustatory hindbrain regions (spinal trigeminal nucleus)
(text based on: Embryonic origin of gustatory cranial sensory neurons.[10])
Stage 22
Section (B4) through head showing tongue and head structures.
References
- ↑ <pubmed>17108952</pubmed>
- ↑ <pubmed>17903280</pubmed>
- ↑ <pubmed>11474141</pubmed>
- ↑ <pubmed>24993944</pubmed>
- ↑ <pubmed>23467090</pubmed>| Nature
- ↑ <pubmed>23182899</pubmed>
- ↑ <pubmed>21655085</pubmed>| PMC3107195 | http://www.plosgenetics.org/article/info%3Adoi%2F10.1371%2Fjournal.pgen.1002098 PLoS Genetics]
- ↑ <pubmed>19363153</pubmed>
- ↑ <pubmed>8955790</pubmed>
- ↑ <pubmed>17826760</pubmed>
Reviews
<pubmed>21184814</pubmed> <pubmed>20696704</pubmed>| JCB
Articles
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Additional Images
- Tongue Images: Tongue Sk Muscle | Salivary gland sk muscle HE | Unlabeled Salivary gland sk muscle HE | Filiform papillae HE | circumvallate papilla VG | circumvallate papilla HE | Taste buds VG
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Cite this page: Hill, M.A. (2024, June 5) Embryology Sensory - Taste Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Sensory_-_Taste_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G